If the squeaking is coincident with suspension movement (hitting bumps, etc.) when at full turn left or right, then greasing the steering stops should solve it.

Otherwise, from your description it could also be as simple as a loose power steering belt or being low on power steering fluid.


'97 4Runner, '06 F350, '86 4Runner, '05 WR450
http://home.4x4wire.com/erik